Law of Sines and Cosines

Mathematics
Tutor: None Selected Time limit: 1 Day

In triangle ABC, if B=14.4 degrees, C=25.8 degrees, and a=315cm, find all missing parts.

a.A=139.8 degrees, b=121 cm, c=212 cm

b.A=140.8degrees, b=121 cm, c=211 cm

c.A=140.8 degrees, b=124 cm, c=212 cm

d.A= 139.8 degrees, b=124 cm, c=211cm

May 28th, 2015

Angle A = 180-14.4-25.8 = 139.8

as per sine rule  we know that   ;  a/sin A = b/sin B

or b = 315* sin 14.4 / sin 139.8 = 121.36

 hence correct answer is

a.A=139.8 degrees, b=121 cm, c=212 cm

May 28th, 2015

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